Method of treating benign prostatic hypertrophy with aureofacin

ABSTRACT

Orally administered compositions for treating prostatic hypertrophy are described herein, these compositions containing an effective dose of a pharmaceutical formulation comprising aureofacin a polyenic macrolide. Also, the method of treating prostatic hypertrophy with such compositions, is described herein.

United States Patent 1191 [11] 3,920,813 Gordon 5] Nov. 18, 1975 [54] METHOD OF TREATING BENIGN [51] Int. Cl. A61K 35/00 PROSTATIC HYPERTROPHY WITH [58] Field of Search 424/1 15 AUREOFACIN [75] Inventor: Harry W. Gordon, Bronx, NY. [56] References cued OTHER PUBLICATIONS [73] Assgnee' g g f Chemical Abstracts 78:164119g 1973 [22] Filed: Nov. 12, 1973 Primary ExaminerJerome D. Goldberg [211 App]. Na: 414,968 Attorney, Agent, or Fzrnz--Darby & Darby Related US. Application Data [57] ABSTRACT [60] Division of Ser. No. 313,568, Dec. 8, 1972, which is Orally administered compositions for treating prosdi ision of Sero- .0 Oc 1971, which tatic hypertrophy are described herein, these composia 70,509, P 3, 1970, tions containing an effective dose of a pharmaceutical g ggl 'g glgg ga igg s ifig 32 formulation comprising aureofacin a polyenic macroa 1 u Bl'. 623,847, March 17, 1967, Pat. No 3,584,118. 0 the method triiatmg piostanc hypertro' phy with such compositions, 15 described herein. [52] US. Cl. 424/115 4 Claims, N0 Drawings METHOD OF TREATING BENIGN PROSTATIC HYPERTROPHY WITH AUREOFACIN This application is a divisional of copending application Ser. No. 313,568, filed Dec. 8, 1972, which is a divisional of application Ser. No. 194,052, filed Oct. 29, 1971, which is a divisional of application Ser. No. 70,509, filed Sept. 8, 1970, which is a continuation-inpart of copending application Ser. No. 544,712, filed Apr. 25, 1966, now abandoned, and a continuation of application Ser. No. 623,847, filed Mar. 17, 1967, now US. Pat. No. 3,584,118.

This invention relates to a composition containing a polyenic macrolide compound and the method of treating prostatic hypertrophy by orally administering the same.

i It is known that prostatic hypertrophy may in limited cases be treated by the administration of hormones such as steroids. However, the treatment with steroids or other hormones is severely restricted since its effect is related to the suppression of the secretion of a gonadotrophic substance by the adrenal cortex. Further, the administration of a hormone carries with it extensive physiological effects on the organ and organ systems in addition to the prostate. Therefore, there has not been available a composition for the treatment of prostatic hpertrophy which has a broad spectrum of effectiveness independent of the cause of the prostatic hypertrophy.

A great number of polyenic macrolide antibiotic compounds are known today which are used or proposed for use as antifungal chemotherapeutic agents and which have been the subject of extensive scientific investigation in past years. Biologically, the polyene macrolide antibiotics have been recognized to be potent chemotherapeutic agents against a wide variety of yeasts and fungi. However, the use of these polyenic macrolide compounds for the treatment of certain fungal infections has been limited by their poor oral obsorption from the gastrointestinal tract. The application of these polyenic macrolide antibiotic compounds has been restricted primarily to topical use.

It has now been unexpectedly discovered that the oral administration of a polyenic macrolide composition, has a selective effect on the prostate gland in mammals which does not appear to express its effect by stimulating or suppressing hormonal producing endocrine glands. Its effect on the prostate is carried out by reducing its size and altering its hypertrophic histological picture and texture to that of a normal appearing gland. This effect is believed not due to the antibiotic function of these polyenic macrolide compounds but apparently to their chemical structure.

Accordingly, one aspect of the present invention is to provide a method for the treatment of prostatic hyper trophy which comprises orally administering an effective dose of aureofacin a specific known polyenic macrolide compound.

Another aspect of the present invention is to provide an orally administered composition for the treatment of prostatic hypertrophy which composition comprises a pharmaceutical formulation comprising an effective dose of aureofacin a specific known polyenic macrolide compound. j

An additional aspect of the present invention is to provide an enteric tablet or capsule containing an effective dose of a composition of the present invention for the treatment of prostatic hypertrophy.

Other aspects of the invention will be apparent from the following detailed description.

According to the present invention, the compositions found effective for the treatment of prostate hypertrophy in mammals comprise aureofacin, a polyenic macrolide composition. Since the polyenic compounds were first discovered in 1950, a large body of literature has become available describing the extensive chemical investigation of these compounds and demonstrating that they possess generally similar chemical properties. The present broad classification of the polyenic macrolide compounds is due to the work of Oroshnik et al., in 1955 (see Polyenentibiotics, Science, Vol. 121, pp. 147-149). In 1955 only nine polyenic macrolide compounds had been isolated in reasonably pure form but since then well over 50 polyenic macrolide compounds have been reported. Undoubtedly some of these polyenes have been reported more than once under different names.

The known polyenic macrolide compounds have been produced as antibiotics by cultivation of Streptomyces in different media and by extraction of the substances from these cultures. It has been demonstrated in the literature that the known polyenic compounds are (l) of fairly high molecular weight (ca. 700-1500), (2) contain macrocylic lactones, better known as macrolides (hereinafter referred to as polyenic macrolide compounds), and (3) each possess a chromophore in the nucleus of from 4 to 7 conjugated double bonds (tetraenes, pentaenes, hexaenes, and heptaenes) identified by examination of their ultra-violet absorption spectra. These conjugated systems are generally unsubstituted (except the methyl pentaenes) and either of the all-trans or cis-trans configuration. Based on the evidence available to date, it is indicated that the known polyenic macrolide compounds contain a twenty-six to a thirty-seven membered lactone ring wherein all of the ring atoms except the single oxygen atom are carbons. The evidence to date also indicates that only C, H, O, and N are present in the known polyenic macrolide compounds.

Any single known polyenic macrolide compound may have substituents linked to the ring such as amino sugars and N-acyl derivatives thereof, aromatic amines and N-acyl derivatives thereof, carboxyls, methyls, carbonyls, aliphatics, hydroxy aliphatics and epoxies. The majority of the polyenic macrolides are amphoteric substances. The acidity of these polyenes is due to a carboxyl group and the basicity of the amphoteric polyenes is due to the presence of an amino sugar known as mycosamine (3-amino 3,6 dideoxy-D-mannose), or perosarnine (4-amino 4,6 dideoxy-D-mannose). The basicity may also be due to the additional presence of aromatic amino moieties. Some polyene macrolides such as filipin, lagosin and fungichromin are neutral. The substitution of the amine function with such organic radicals as acyl groups reduces the effectiveness of the macrolide nucleus in the treatment of prostate hypertrophy but does not destroy this activity. The acylation results in neutralization of the basic properties and improved solubilities of the N-acylated derivative in various media, such as organic solvents, and readily permits the formation of water soluble salts, as fully described in US. Pat. No. 3,244,590.

The following articles should be consulted for references to the discovery, isolation and chemical properties of the polyenic macrolide compounds:

4. W. Oroshnik et al., Fortschritte der Chemie Organischer Naturstoffe Vol. XXI, pp 18-79 (1963).

A. Aromatic I Identified as those compounds containing the heptaene macrolide nucleus, one carboxyl group, a single amino sugar moiety (mycosamine) glycosidically linked to the macrolide nucleus and an aromatic amino moiety (p-aminophenyl) aldolically linked to the macrolide nucleus. Representatives of this group are (a) candicidin which may possibly be identical to trichomycin A, hamycin (minor component), heptamycin, ascosin and levorin A (b) trichomycin B which may possibly be identical to levorin A hamycin (major component) and PA-l50; and (c) levorin A.

B. Aromatic ll Identified as those compounds containing the heptaene macrolide nucleus, one carboxyl group, an amino sugar (mycosamine) glycosidically linked to the macrolide nucleus, and an aromatic amino moiety (N-methyl-p-aminophenyl) aldolically linked to the macrolide nucleus. Representative polyenic macrolides of this group are: (a) candimycin, and (b) hamycin (minor component of hamycin complex).

C. Aromatic III Identified as those compounds containing the heptaene macrolide nucleus, an aromatic amino moiety (N-methyl-p-aminophenyl), aldolically linked to the macrolide nucleus, and an amino sugar (perosamine), glycosidically linked to the macrolide nucleus. It is noted that the aromatic amino moiety just identified has previously been incorrectly reported in the literature as a p-aminobenzyl moiety. Representative of this group is fungimycin. This substance was originally styled by antibiotic number NC 1968 and for a brief interval identified as perimycin and aminomy- D. Non-Aromatic Identified as those compounds containing the heptaene macrolide nucleus, one carboxyl moiety and a single amino sugar (mycosamine), glycosidically linked to the macrolide nucleus. Representative of this group are: (a) candidin; (b) candidinin; (c) candidoin; (d) amphotericin B; (e) mycoheptin; (f) levorin B; and (g) antibiotic F-l7-C.

E. Poorly Defined Heptaenes: A number of heptaene macrolide compounds have been described in the literature but have not as yet been sufficiently characterized as to all the substituents linked to the polyenic macrolide nucleus. These heptaene macrolides are Streptomyces abikoensis heptaene, aureofacin, antibiotic 757, ayfactin A, ayfactin B, antifungin 4915, eurotin A, antibiotic AE-56, antibiotic 28l4-I-I, gmbilin, monicamycin, antibiotics A, B, and C from streptomyces species related to S. viridans.

It will be understood that where a polyenic macrolide compound of the class herein described is identical with one of the above named compounds, but has been known by another name by reason of independent production or production in accompaniment to other antibiotics, the identification of such substances by the name set forth above is intended to mean the same compound under all other designations.

In the preparation and administration of dosages, a variety of pharmaceutical formulations may be employed, such as capsules, or tablets, preferably in enteric form. The quantity of effective does supplied by each capsule or tablet is relatively unimportant since the total dosage can be reached by administration of either one or a pluralityof capsules or tablets or both. The capsules employed may compose any well known pharmaceutically acceptable material, such as gelatin, cellulose derivatives, etc. The tablets may be formulated in accordance with conventional procedure employing solid carriers, lubricants, etc., well known in the art. Examples of solid carriers are: starch, sugar, bentonite and other commonly used carriers.

The following examples illustrate suitable pharmaceutical formulations containing the compounds of this invention.

EXAMPLE 1 Hard gelatin capsule available from the Robin Pharmacal Corporation (size 00) is filled with about 0.83 grams of lactose (Fast Flow available from Foremost Dairies, Inc.) and about mg. of active material, the lactose and active ingredient being triturated together in a pestle and mortar until a very fine yellow amorphous powder resulted, prior to filling of the capsule. Obviously, any desired number of capsules may be filled by mixing together any amount of lactose and active ingredient in the same weight ratio indicated above so that each capsule will contain 100 mg. active ingredient; and the quantity of active ingredient may be altered, as desired, by varying the weight ratio of the indicated materials.

EXAMPLE 2 g. of corn starch and 21 12.5 g. lactose are dried at F for 12 hours before compounding. After drying, each of these materials is sifted through a No. 14 mesh stainless steel screen. The sifted corn starch and lactose are thoroughly mixed for 30 minutes and to this mixture there is added a blended mixture of 250 g. active ingredient and 12.5 g. magnesium stearate. This admixture is blended and then compressed on a tableting machine into 5000 substantially round tablets each containing 50 mg. active ingredient and weighing about 500 mg.

EXAMPLE 3 Enteric tablets for use in this invention may be formulated as follows:

16 g. of powdered corn starch (U.S.P. quality) is dried at 120F for 12 hours and passed through a No. 25 mesh stainless steel screen. The sifted corn starch is then mixed with 255 g. of anhydrous lactose (direct tablet grade). To this mixture, 4 g. of magnesium stearate is added followed by 50 g. of the active ingredient. These materials are then mixed in a small pebble mill for 30 minutes and compressed on a single punch machine producing l,000 tablets, each containing 50 mg. active ingredient. Each tablet weighs approximately 325 mg. The average hardness is 6, as measured on a Monsanto Hardness Tester.

The tablets are then placed in a coating pan rotating at 29 r.p.m. and subjected to warm air of approximately 80F for about 10 minutes. Then 30 ccs of a pharmaceutical glazed composition is applied, this composition being refined wax and rosin free orange flake shellac with anhydrous alcohol as the medium therefor.

Talcum (U.S.P.) or similar dusting powder is applied to the tablets to prevent the tablets from sticking to each other or to the pan and this procedure is followed after For a description of the procedure for manufacturing enteric formulations such as those exemplified heretofore, reference should be made to U.S. Pat. Nos.

the application of each coat to the tablets. The coat is 2,196,768; 2,433,244; 2,455,790; 2,540,979; allowed to dry for approximately 1 hour. Thereafter 5 2,858,252; 3,080,346 and British Pat. Nos. 760,403 three additional coats are applied in a similar manner, and 820,495. each coat comprising 30 ccs of the pharmaceutical The effectiveness of the compounds of this invention glaze, with approximately 1 hour of drying time bein treating prostatic hypertrophy has been confirmed tween the application of successive coats. After four by tests in large mammals, i.e., those weighing at least coats are applied the tablets are dried overnight at about 1 kilogram. For example, tests were conducted room temperature and then four more coats are apon dogs to demonstrate the effectiveness of the polyplied in the same manner using the same composition. enic macrolide compounds in reducing the size of the Each coat is allowed to air dry for 3 hours before applyprostate gland. ing the next coat. Each of the 8 coats of the enteric tab- In one study, 10 dogs were used to determine the aclets is approximately 0.001 inch in thickness. Obvition of candicidin, the results of which are reported in ously, the thickness of the coating can be controlled by Table I below. varying the concentration of the pharmaceutical glaze Each dog was examined for the gross presence of in the alcohol medium. prostatic hypertrophy by palpation. All of the dogs, The enteric tablets are tested in accordance with the with the exception of two, were at least 10 years of age. in vitro disintegration test for enteric-coated tablets de- The dogs were housed under kennel conditions for a scribed in U.S.P. XVII and were found to pass this test. week prior to the oral administration of candicidin.

While the number of coats used in the example here- During the acclimatization period the dogs became adtofore described is 8, it will be appreciated that there justed to the feeding and kennel routine. A thorough are many factors to be considered which permit variaexamination of the dogs, including electrocardiogration in the number of coats, including the size and phy, was undertaken during the acclimatization period. shape of the tablets or capsules, the type of coat or Four of the dogs exhibited a cardiac condition, not uncombination of coats, etc. usual for older dogs, which was confirmed by electro- Other procedures and materials well known in the cardiography and subsequently at necropsy. This carprior art may be employed to prepare suitable enteric diac condition did not affect the course of the expericoatings. The selection of the coating substance is govmental trial and indeed was helpful in establishing that emed to a large extent by pH and enzyme considereven in the presence of such a condition candicidin ations and the desire to have the enteric composition may be safely administered. disintegrate or dissolve when it reaches the duodenum After the 1 week acclimatization period, a surgical region of the intestinal tract and not in the stomach. laparotomy was performed on each of the dogs under The disintegration or dissolution of an enteric coating general anesthesia. The prostate gland was measured in in the intestinal tract usually depends on several facthree dimensions, lateral, cranial-caudal and dorsaltors, the most important of which are (1) the presence ventral and was palpated to determine it consistency. of acidic groups in the enteric substance which cause it Visual observation of the bladder, intestines, the caudal to be insoluble in the low pH environment of the stompole of the kidney, and spleen were made, and the palach but soluble in the intestinal tract due to the higher pation of the liver and kidney was accomplished. In all (but usually not alkali) pH of the media there, and (2) but three of the dogs a punch biopsy of the prostate was the resistance of the coating to attack by oral and gastaken. The biopsy specimen taken from the left hemitric enzymes. sphere of the prostate gland was fixed in formalin for Illustrative of other well known substances that may histological and microscopic examination. The omisbe used for the enteric coating are the following: cellusion of a biopsy in three dogs was instituted as a control lose acetate phthalate with resinous carrier; cellulose to determine whether the trauma of taking the biopsy acetate phthalate-tolu balsam-shellac; cellulose acetate of the prostate gland might have some influence on inphthalate with fats and waxes; shellac-Castor oil; amflammation and size of prostatic tissue. In addition, moniated shellac; shellac-stearic acid-tolu balsam; steablood and urine specimens were taken for candicidin ric acid-castor oil over shellac-silica gel, cellulose ace- 5O assay and routine examination. tate phthalates with or without plasticizer and dusting The dogs were permitted to recover from the surgical powder(s); acid phthalates of glucose, fructose, etc; laparotomy following which each of the dogs was ternary copolymers of styrene, methacrylic acid and placed on a regimen of oral administration of candicibutyl half-ester of maleic acid; alkyd resin-unsaturated din in accordance with the schedule of dose administrafatty acids-shellac; polyvinyl acid phthalate, etc. tion given in Table I below. The drug was administered in a hard gelatin capsule in the animal feed.

TABLE I Animal Prostate Size*** 71 Decrease Daily Body Cranial- In Gland Size Dog Age Dosage Dose Weight Lateral Caudal Dorsal- From Initial No. Procedure (years) (mg) Days (lbs) mm (mm) Ventral Volume lst Laparotomy 53 45 35 40 1 2nd Laparotomy 10 13 30 40 40 35 40 11.0

Autopsy 200* 20 41 42 45 31 7 lst Laparotomy 25 20 20 15 2 2nd Laparotomy 4 100* 30 20 17 17 10 51.5 Autopsy V 0** 2O 20 l7 l9 l4 24.5 lst Laparotomy 55 26 30 25 3 2nd Laparotomy 13 100* 30 44 26 30 22 12.0 Autopsy 400** 14 36 26 25 25 17.0

TABLE I-continued Animal Prostate Size*** Decrease Daily Body Cranialln Gland Size Dog I Age Dosage Dose Weight Lateral Caudal Dorsal- From lnitial No. Procedure (years) (mg) Days (lbs) mm (mm) Ventral Volume lst Laparotomy 72 O 50 40 4 2nd Laparotomy 10 100* 30 61 41 39 32 48.8

Autopsy 600** 14 50 35 35 27 77 5 lst Laparotomy l7 32 40 40 30 47.0

Autopsy- 200* .30 34 6 lst Laparotomy 10 39 37 30 28 8.5

Autopsy 300* 30 25 34 35 25 lst Laparotomy 8 33 37 26 25 21.0 7" Autopsy 300* 30 28 27 26 27 lst Laparotorny 15+ 30 60 50-55 45 26.5 8" Autopsy 300* 5 55 4550 40 1st Laparotomy ll-l 3 30 42 42 34 65.0 9" Autopsy 300* 30 2O 30 28 25 lst Laparotomy lO-ll 34 35 28 28 67.2 l0 Autopsy 300* 30 25 22 24 17 *The daily dosage administered after the first laparotomy. The daily dosage administered after the second laparotomy.

***The Prostate volume is approximated by multiplying the three dimensions indicated.

"No biopsy taken.

As indicated in Table l a second surgical laparotomy was performed on four of the 10 dogs in lieu of autopsy because these four dogs were subsequently continued on an altered dose of candicidin to determine whether increase of the drug dose or discontinuance of dosage would further affect prostate size. The remaining six dogs were sacrificed and autopsied after completion of the administration of candicidin. The four dogs in which a second laparotomy was performed were autopsied after completion of the administration of candicidin for the period specified in the above table.

At the time of the second laparotomy and at necropsy the prostate gland was measured and biopsy specimens of the prostate gland of each dog were taken, with the exception of the three dogs indicated in the table for which no biopsy specimens were taken.

In addition, at necropsy, histologic specimens were taken of the general organs prostate, bladder, pancreas, kidney, adrenal, liver, spleen, testes, intestines, caecum, lung, thyroid and heart for further microscopic examination, in order to determine whether any toxic reactions had occurred. All tissues taken were formalin fixed and prepared for microscopic examination. The histologicstudy of the organs listed did not reveal any evidence of drug toxicity.

At necropsy, blood and urine samples were obtained for assay. The assay method was essentially the procedure described for the assay of Nystatin-Candicidin in Assay Methods of Antibiotics 1955, a laboratory method, Donald'C. Grove and William D. Randall, pp. 116-119: Method 2. The samples of dog serum and urine investigated microbiologically showed no antifungal activity. The assay tests establish the absence of candicidin in the blood and urine of the test animals.

As shown in the above table, the trauma induced by taking of a biopsy of the prostate gland was not the cause of the reduction in the size of the prostatic tissue. The gross appearance and measurements of the prostate gland taken prior to the adminsitration of candicidin and at laparotomies performed after the drug had been administered revealed a marked reduction of the size of the prostate gland and normal consistency of the gland which is consistent witha significantly younger age of dog. Microscopic examination of the biopsy specimens of the prostate gland on each dog taken at each'of the surgical procedures performed confirmed the gross observation of normal appearance and a substantial reduction of size.

The histologic evaluation of the prostate biopsies of dogs taken prior to candicidin administration and at laparotomies did not reveal any cytotoxicity in the gland. The enlarged prostate gland prior to drug administration is characterized by considerable epithelial tufting or papillation; cells are tall, columnar with granular cytoplasm, and gland acini are compressed. The marked reduction in the size of the prostate gland after candicidin administration is accompanied by a decrease in the size of the columnar epithelial cells which are mostly cuboidal; diminished or absent granularity; and papillations are reduced or absent.

As indicated in the above table, body weight loss does not appear to be related in any quantitive way to the dose of the drug administered since the dogs that received mg/day showed a body weight loss no less or greater than those animals receiving a higher dosage. The data also show that a short time of administration, as noted with dog No. 8 of a relative high dose, 300 mg daily, for 5 days, effected a significant reduction in size of the prostate gland. In the case of dog No. 2, candicidin administration was discontinued after the second laparotomy as indicated in the table and after an additional 20 days of absence of drug administration, it was found thatthe prostate gland began to increase in size and had achieved about a 50 percent return towards the volume noted at the start of the experiment. However, in this dog the prostate gland was not initially pathologically enlarged.

In some of the dogs diarrhea and vomiting occurred upon the oral administration of candicidin but these effects appeared to be overcome when the dogs were fed a supplement of vitamin B-complex and lacto-bacilli.

Similar tests were conducted on dogs using nystatin (a tetraene). The gross appearance and measurements of the prostate gland taken prior to the administration of nystatin and at laparotomies performed after the drug had been administered also revealed a reduction in size of the prostate gland but to a lesser extent than the candicidin treated dogs.

Other tests conducted with polyenic macrolide compounds in mammals appear to indicate that the larger the chromophore in the macrolide nucleus the more effective is the compound in treating prostatic hypertrophy. Accordingly, the heptaene macrolide compounds are preferably used because they have been found to generally give the best results whereas the 9 tetraene macrolide compounds, generally, are least effective in reducing the size of the prostate gland.

It is also indicated that cleavage or other alteration of the macrolide nucleus which opens the lactone ring will destroy the activity of the compounds as will alteration of the chromophore present in the nucleus by total hydrogenation.

Tests conducted with various polyene macrolide compounds including filipin, amphotericin B and fungimycin, indicate that the side chain groups commonly found in the polyenic macrolide compounds are not essential to activity for treating prostate hypertrophy.

It is preferred, commensurate with the desideratum of obtaining the highest degree of effectiveness of the compositions of this invention per given dose of active ingredient, to use an enteric tablet or capsule. Thus when using a specific known polyene macrolide compound in the form of an enteric solid, the entire compound will remain intact when it reaches the intestinal tract so long as the enteric coating composition retains its integrity in the stomach. On the other hand, administration of the same dose in a standard solid pharmaceutical formulation may result in a cleavage of any amino sugar present, or of other groups similarly sensitive to gastric conditions. Such cleavage may further result in alteration of the polyenic macrolide nucleus,

10 thereby diminishing the effectiveness of the active ingredient.

The effective dosage of the compounds of this invention depends upon the severity of condition, the stage and the individual characteristics of each mammal being treated. It is expected that the compositions will generally be administered in a dosage range from about 1 mg to about mg active ingredient per kg of body weight per day and preferably from about 5 mg to about 40 mg per kg of body weight per day.

What is claimed is:

1. A method for the treatment of benign prostatic hypertrophy in a large mammal afflicted with prostatic hypertrophy which comprises orally administering to said mammal an effective dose for treating prostatic hypertrophy of aureofacin.

2. A method for the treatment of benign prostatic hypertrophy as recited in claim 1, which comprises administering said aureofacin in enteric coated form.

3. A method for the treatment of benign prostatic hypertrophy as recited in claim 1, wherein said effective dose comprises from about 1 mg. to about 100 mg. aureofacin per kilogram of body weight per day.

4. A method for the treatment of benign prostatic hypertrophy as recited in claim 3, wherein said effective dose comprises from about 5 mg. to about 40 mg. of

aureofacin per kilogram of body weight per day. 

1. A METHOD FOR THE TREATMENT OF BENIGN PROSTATIC HYPERTROPHY IN A LARGE MAMMAL AFFLICTED WITH PROSTATIC HYPERTROPHY WHICH COMPRISES ORALLY ADMINISTERING TO SAID MAMMAL AN EFFECTIVE DOSE FOR TREATING PHOSTATIC HYPERTROPHY OF AUREOFACIN.
 2. A method for the treatment of benign prostatic hypertrophy as recited in claim 1, which comprises administering said aureofacin in enteric coated form.
 3. A method for the treatment of benign prostatic hypertrophy as recited in claim 1, wherein said effective dose comprises from about 1 mg. to about 100 mg. aureofacin per kilogram of body weight per day.
 4. A method for the treatment of benign prostatic hypertrophy as recited in claim 3, wherein said effective dose comprises from about 5 mg. to about 40 mg. of aureofacin per kilogram of body weight per day. 